M6s in PF is the most miserable and unfun high end fight in the game

[Absurdity]

That said, I mostly agree otherwise. At the very least FFXIV could learn a lot from WoW's tank and healer design.

Certainly when it comes to how those classes achieve their primary purpose.

Every tank in XIV is just the same flat % mitigation cooldowns and then some slightly different flavour ability, which rarely ever change your mitigation plan.
Meanwhile the tanks in WoW achieve "mitigate damage to not die and smooth out damage spikes to make your healer's life easier" in very different ways.